CAJ | 학술논문

根据光纤光学传输理论建立了偏芯光纤的理论计算模型，通过菲涅耳公式推导出偏芯光纤倏逝波的表达式，进而求出了倏逝波的穿透深度。运用RSoft软件中的BeamPROP模块对偏芯光纤进行光学结构建模，仿真出偏芯光纤中的模场分布、倏逝波场以及基模有效折射率随纤芯偏移距离的变化趋势。仿真结果表明：偏芯光纤的包层倏逝波散射随着纤芯与外界介质距离δ增大而显著减小；同时基模有效折射率随纤芯与外界介质距离δ的增大而显著增大，当δ达到8μm时，有效折射率趋于稳定。
근거광섬광학전수이론건립료편심광섬적이론계산모형，통과비열이공식추도출편심광섬숙서파적표체식，진이구출료숙서파적천투심도。운용RSoft연건중적BeamPROP모괴대편심광섬진행광학결구건모，방진출편심광섬중적모장분포、숙서파장이급기모유효절사솔수섬심편이거리적변화추세。방진결과표명：편심광섬적포층숙서파산사수착섬심여외계개질거리δ증대이현저감소；동시기모유효절사솔수섬심여외계개질거리δ적증대이현저증대，당δ체도8μm시，유효절사솔추우은정。
The theoretical model of the eccentric core fiber is established according to the traditional optical transmission theory. Moreover, the expression of evanescent wave of eccentric core is deduced according to Fresnel equation so that the depth of penetration is solved. Through the structure modeling of eccentric core optical fiber completed by BeamPROP module, the variation trend of modal field distribution, evanescent wave, as well as fundamental mode effective index with the eccentric distance is obtained. The simulation result shows that the evanescent wave declines with the increase of δ. The fundamental mode effective index increases as δ dose, and it will be stabilized when δ equals 8 μm.